Dear Salyd,
After your reference I found that the sounds are not proper. I will post the same in another format soon. at present mute the sound and use it.
My mail ID is vraj626@yahoo.co.in.
Thank you.

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Have you seen a floor mat ? Can you climb over it? Here is a wooden box Can you climb over it? Can you identify the difference between
these questions? PLANES AND SOLIDS 4

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We can only sit on the mat because
it is spread flat on the floor. But We can climb on the box because it has some height. Yes this is the difference between
Plane Surface and Solids Surface has two dimensions length and Breadth Yes you are right! But solids have three dimensions
length , Breadth and height 5

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PERIMETER He runs 4 equal lengths s+s+s+s units)and
Thus he runs s+s+s+s = 4s units
This is called as perimeter of a square. Consider a boy running around a Square field.
How much distance did he run? Side (s) 11 Side ( s) Side (s) Side (s)

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13 Find the perimeter of the colored plane figures

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Surface measurement Area is the surface occupied by a plane figure. Area is the product of two linear measurement of same unit.
It occupies several squares. We measure Surface as Areas. Ex:
The mat spread on the floor occupies some space.
The cost of painting the wall depends on the Space which is to be painted 14

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Basic formula for areas Area of a square= s x s Square units Area of a Rectangle= l x b Square units 15

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22 What is  ? (sometimes written pi) is a mathematical constant whose value is the ratio of any circle‘s circumference to its diameter in Euclidean space ; this is the same value as the ratio of a circle's area to the square of its radius. It is approximately equal to 3.141593 in the usual decimal notation.
(Ref: Wikipedia) Back 

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Side = s units Side = s units Side = s units 25 ACTIVITY-2 Observe the following models given to you. Hexagon Side = s units Side = s units

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26 ACTIVITY - 3 Derive a formula to find the perimeter of an equilateral triangle.
Derive the formula to find the height of an equilateral triangle (Use Pythogorous theorem)
Derive a formula to find the area of an equilateral triangle.
Derive a formula to find the perimeter of a regular hexagon.
Derive a formula to find the area of a regular hexagon. Derive the following formula using the models given to you. Pythogorous theorem 

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27 PYTHOGOROUS THEOREM Theorem:
In a Right angled triangle
Square of the hypotenuse = sum of the squares of other two sides  BACK NEXT LESSON  [ Hypotenuse is the
side opposite to 90o ] By theorem AC2 = AB2 + BC2
i.e., z2 = x2 + y2.
 x2 = z2  y2.

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28 Volume Volume is the space occupied by an object
(Space is 3 dimensional)
Ex: Juice in a container.
Milk in a vessel.
Volume is the product of three measurements of same unit. [ Length x Breadth x Height for a rectangular vessel ] More details 

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Volume of a cube side = 3 units Side = 3 units Side = 3 units Volume of a Cube = Side x Side x Side = SxSxS= S3 cubic units.

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33 EVALUATION-1 The Perimeter of a square is _______
Area of a square is ________
The perimeter of a rectangle is __________
Area of a Rectangle is _________
The circumference of a circle is _________
The area of a circle is __________
The area of a right angled triangle is ____________
The area of a parallelogram is __________
The perimeter of an equilateral triangle is _______
The height of an equilateral triangle _________
The area of an equilateral triangle __________
The perimeter of a regular hexagon___________
The area of a regular hexagon _____________ l x b sq. units. s2 sq. units. 4s units. 2 ( l + b ) units. 2r units. r 2 sq. units. ½ (bxh) sq. units. bxh sq. units. 3s units. 6 s units.

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EVALUATION-2 The volume of a right angular solid is ________________
The volume of a cube is ________
The volume of a cuboid is __________
The volume of a cylinder is _________ (r 2 ) h cu. units. s3 cu. units. (Base area x Height )cu.Unit ( l x bxh ) cu. units.